Alarm clock



FIG. 1 is a perspective view of an alarm clock showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line portions in the drawings represent portions of the alarm clock that form no part of the claimed design. 

CLAIM The ornamental design for an alarm clock, as shown and described. 